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Type Species |
(PBCV-1) |
The chloroviruses, which are ubiquitous in fresh water throughout the world, infect certain unicellular, eukaryotic, exsymbiotic chlorella-like green algae. The viruses have linear, nonpermuted dsDNA genomes with cross-linked hairpin ends. The DNA termini contain identical inverted 1-2.2 kb repeats. The remainder of the genome is primarily single copy DNA. Viruses in this group can be distinguished from each other by DNA restriction digests, the levels of methylated bases in their genomes, serology, and host specificity.
List of Species Demarcation Criteria
Three groups of viruses are delineated based on host specificity.
Group 1: Paramecium bursaria Chlorella NC64A viruses (NC64A viruses)
Group 2: Paramecium bursaria Chlorella Pbi viruses (Pbi viruses)
Group 3: Hydra viridis Chlorella viruses (HVC viruses)
Chlorella strains NC64A, ATCC 30562, and N1A (originally symbionts of the protozoan P. bursaria), collected in the United States, are the only known host for NC64A viruses. Chlorella strain Pbi (originally a symbiont of a European strain of P. bursaria) collected in Germany, is the only known host for Pbi viruses. Pbi viruses do not infect Chlorella strains NC64A, ATCC 30562, and N1A. Chlorella strain Florida (originally a symbiont of Hydra viridis) is the only known host for HVCV. NC64A viruses are placed in 16 species based on plaque size, serological reactivity, resistance of the genome to restriction endonucleases, virus encoded restriction endonucleases and nature and content of methylated bases.
Official virus species names are in italics. Tentative virus species names, alternative names ( ), strains or serotypes are not italicized. Virus names and assigned abbreviations ( ) are:
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1-Paramecium bursaria Chlorella NC64A virus group: |
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Paramecium bursaria Chlorella virus 1 |
(PBCV-1) |
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Paramecium bursaria Chlorella virus AL1A |
(PBCV-AL1A) |
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Paramecium bursaria Chlorella virus AL2A |
(PBCV-AL2A) |
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Paramecium bursaria Chlorella virus BJ2C |
(PBCV-BJ2C) |
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Paramecium bursaria Chlorella virus CA4A |
(PBCV-CA4A) |
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Paramecium bursaria Chlorella virus CA4B |
(PBCV-CA4B) |
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Paramecium bursaria Chlorella virus IL3A |
(PBCV-IL3A) |
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Paramecium bursaria Chlorella virus NC1A |
(PBCV-NC1A) |
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Paramecium bursaria Chlorella virus NE8A |
(PBCV-NE8A) |
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Paramecium bursaria Chlorella virus NY2A |
(PBCV-NY2A) |
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Paramecium bursaria Chlorella virus NYs1 |
(PBCV-NYs1) |
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Paramecium bursaria Chlorella virus SC1A |
(PBCV-SC1A) |
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Paramecium bursaria Chlorella virus XY6E |
(PBCV-XY6E) |
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Paramecium bursaria Chlorella virus XZ3A |
(PBCV-XZ3A) |
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Paramecium bursaria Chlorella virus XZ4A |
(PBCV-XZ4A) |
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Paramecium bursaria Chlorella virus XZ4C |
(PBCV-XZ4C) |
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2-Paramecium bursaria Chlorella Pbi virus group: |
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Paramecium bursaria Chlorella virus A1 |
(PBCV-A1) |
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3-Hydra viridis Chlorella virus group: |
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Hydra viridis Chlorella virus 1 |
(HVCV-1) |
Tentative Species in the Genus
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1-Paramecium bursaria Chlorella NC64A virus group: |
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Paramecium bursaria Chlorella virus AL2C |
(PBCV-AL2C) |
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Paramecium bursaria Chlorella virus CA1A |
(PBCV-CA1A) |
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Paramecium bursaria Chlorella virus CA1D |
(PBCV-CA1D) |
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Paramecium bursaria Chlorella virus CA2A |
(PBCV-CA2A) |
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Paramecium bursaria Chlorella virus IL2A |
(PBCV-IL2A) |
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Paramecium bursaria Chlorella virus IL2B |
(PBCV-IL2B) |
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Paramecium bursaria Chlorella virus IL3D |
(PBCV-IL3D) |
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Paramecium bursaria Chlorella virus IL5-2s1 |
(PBCV-IL5-2s1) |
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Paramecium bursaria Chlorella virus MA1D |
(PBCV-MA1D) |
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Paramecium bursaria Chlorella virus MA1E |
(PBCV-MA1E) |
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Paramecium bursaria Chlorella virus NC1B |
(PBCV-NC1B) |
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Paramecium bursaria Chlorella virus NC1C |
(PBCV-NC1C) |
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Paramecium bursaria Chlorella virus NC1D |
(PBCV-NC1D) |
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Paramecium bursaria Chlorella virus NE8D |
(PBCV-NE8D) |
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Paramecium bursaria Chlorella virus NY2B |
(PBCV-NY2B) |
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Paramecium bursaria Chlorella virus NY2C |
(PBCV-NY2C) |
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Paramecium bursaria Chlorella virus NY2F |
(PBCV-NY2F) |
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Paramecium bursaria Chlorella virus NYb1 |
(PBCV-NYb1) |
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Paramecium bursaria Chlorella virus SC1B |
(PBCV-SC1B) |
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Paramecium bursaria Chlorella virus SH6A |
(PBCV-SH6A) |
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Paramecium bursaria Chlorella virus XZ5C |
(PBCV-XZ5C) |
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Paramecium bursaria Chlorella virus CVBII |
(PBCV-CVBII) |
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Paramecium bursaria Chlorella virus CVK2 |
(PBCV-CVK2) |
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Paramecium bursaria Chlorella virus CVU1 |
(PBCV-CVU1) |
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2-Paramecium bursaria Chlorella Pbi virus group: |
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Paramecium bursaria Chlorella virus B1 |
(PBCV-B1) |
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Paramecium bursaria Chlorella virus G1 |
(PBCV-G1) |
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Paramecium bursaria Chlorella virus M1 |
(PBCV-M1) |
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Paramecium bursaria Chlorella virus R1 |
(PBCV-R1) |
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3-Hydra viridis Chlorella virus group: |
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Hydra viridis Chlorella virus 2 |
(HVCV-2) |
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Hydra viridis Chlorella virus 3 |
(HVCV-3) |
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